Manufacture of gear wheels



C. A. PARSONS ET AL MANUFACTURE OF GEAR WHEELS Nav. 3, 1925. 1,559,908

Nov. 3, 1925. v v l1,559,908

C. A. PARSONS ET AL MANUFAGTURE 'oF GEAR WHEELS Filed Oct. 23, 1924 Nov. 1'y 1925. 1,559,908

C. A. PARSONS ET AL MANUFACTURE OF' GEAR WHEELS v Filed oct, 2:5, 1924 5 snets-sneet 5 Nov. 3, 1925. Lxm

C. A. PARSONS ET AL MANUFACTURE OF' GEAR WHEELS Filed @en 23,f1924 sxmtsmetu O 9 o IJ, fll 4 i Nw. 3, 192s.

c. A. PARsNs s-:r Al. uuuuc'xguns 017-*A mxwnnzns' Filed oct. as. 1924 5 Sheng-Sheet 5 hereinafter vmaster Wheel.

lllaten'ted Nov.

- UNITED STA-'ras PAT-ENT@ omc'.:

CHARLES ALGEBNON 'rAsoNs STANLEY sniITI cook; Nn Jomq 303D, olv cAsrLE-oN-TYNE, ENGLAND; SAID coax AND rom) AssIeNons 'rosAID 115mm?? p 'l 'MANUFACTUR'E orGEAnvvHnELs,

i'piiontion ined october 23, i924.` serial in. 745,518.

To allivlwm it may concern.: Be it known that we, CHARLES ALGhRNoN PARSONS, STANLEY vSMITH Coon, and Jenn.

FORD, all subjects of the King lof Great Britain and' Ireland, and :all residing at Heaton Works, Newcastle-on-Iyne, in the county'ofI Northumberland, En land,"liave invented 'certain new 'and usefu Improve` ments in and'Relating to the Manufacture of Gear Wheels (for which application has been filed in' Great Britain, under Serial Number 25,366, ori Oct. 11, 1923), of which f' Ythe following is a specification.

The invention relates toy improvements in the manufacture of'toothed gear Wheels and has for its main object the production of such a wheel of a, veryliigli degree of accuraoy either for nse'in gear drives or a The present invention consists in theiinproved processes of finishing gear wheels --described and' pointed ont in the c1ai'ms.

A preferred forni of the invention `consists in placing the crown Wheel over the ywheelto be ground with means 4for main# taining their axes 'accurately parallel, fixing one or other of these tivo members, applying torque preferably through resilient means to the other member so as'to bring the toothl faces or" the two members into mutual contact and reciprocating one of the members dite trie grinding.

relatively to the other in a-longitndinal Ydirection parallel to the axis. An abrasive materialv is preferaby employed to expe of grinding in this fashion the angular position of theengagement is altered and a, like amount of grinding done ina new rela tive angular position` and so on in various positions, so that on the completion oi the whole process the teeth on the Wheel lie in 'close contact With those in the crown Wheel in everyposition of engagement. The teeth i applicable to spur gearing but also to helical gears, but in 'the latter A case suitable means must be provided 'for giving the nievparticularly Lifter a certain amount .abrac'ken P, is' bolted to the re n able vvli'eel not only `a motion of translation/ parallel to the'axis` but also a motioiiV of.l rotation. j v f Referring to the accompanyingdraw- .Figure l shows an elevation partly in section, of yone forni of machine suitable fo'r. grinding the teeth of spur Wheels according f to 'the present invention; Figure Q being a plan, and

Figure 3` an end elevation, While vrligures '4, 5 andv 6 are corresponding". views of a niodiiedffform' of macliiiie'adapt-- v ed to grind the'teethA of helical Wheels. Where desirable the same reference letters are used to' denoteycorresponding parts in thedi'erent figure. i In ,order to carry into effect the preferred forni of the invention described above the master spur wheel, A, to be ground is bolted. to a carrier, J, (seefFigures 1,'-2 and 3)" g which is supportedv against a shoulder, H, byl a nutfGr., on the 'lowerve'nd of a rod, F; this rod is forinedjat its upper end witha ball, L, engaging with a bracket, M, carried 80 by thehead E of the machine, which may be reciprocated by any suitable means. I

- Thus, according to one form of such'r'eciprocating means,I a pulley, 2, rotatably mounted in the frame of theunachine'is '95 driven by tliebelt, 3, the usual loose pulley', #j being likewise provided-- 'On the pulley, i 2, is'nioniiteda pin, 5, adjiistablein the diametral groove, '6, the pin lbeing connected by the link, 7, ,-toyoiie end of the, rocking 9U.

lever, 8, pivotally mounted on the frame-ofthe machine, the other end-of'thelever being in turn connected by the link, 9, Vto. the: i A

suitable means, the teetliof thevtw'o'gears A and beii'igwequa'l in'niimber andoonii-h plementary in shape.

, In order to apply `xtorque to lthe' Wh'eeL-A, i

head, E, -whiledn addition brackets, N are attached to the carrier, J. In associa' tion with eachibracket, N, 'isa sprin 0,1105 which can be compressed by its nut,- lo as to force the bracket, N, towards the end of the bracket, P, and so maintain the teeth of the wheel, A and B, in vcontact.- Pre'f-v ferably the parts described are symmtri- U9' ciprocatin l I cally 'arranged in duplicate so that aA pure torque is provided. l

Similar brackets, N, are provided for- 1grinding the opposite fffces of the teeth. f5 After disengagement ot' the spur wheel, A, -and crown wheel` B, the latter is rotated Yinton new position for a further lapping,

oper-ationby means of the worm-Wheel, l0,

mounted on the base, D, carrying-the crown wheel, and actuate'dby the Worm, ll', W0rmshaft, 12, Iand hand-wheel l. l

Inthe forni of the invention shown in Figures, 4,55 and 6, suitable for grinding `the' teeth of the helical wheels, provision is ,15 made not only for the rec'iproeation but also 'beingise'cured t'a ,counteriveighh S. The

arrangement ot pulleys is duplicated at opf posite points, the Weight, S, preferably bef ing coin-mon to the two cords, 'Il With this arrangement 1t will be seen that as the head, E, reclprocutes a torque 1s imparted to the '30 wheel, A,soasto keep its teeth in contact irithrthosevei-t'he frown wheel, B, and perv"mit it to reciprcate in a helical path.`

'In order to prevent the'vv'heel, A, turning 1 under the influence ot the Weight, S, when disengaged Vfor the next. operation holes, Z,

may be providedin the pulleys, U, registering` with similar holes in the bracket, W, so that bolts inserted through thesel holes will prevent the counterweight, S, from fall- 40A ing. The whole Weight of the reciprocating parts as common with machine tools is preferative contact, and' said gea-r Wheels by minacce erably balanced by the counter-weight, 13, l

gting ,by way of the rope, 14, and pulley', vt is not necessary in accordance With the present invention that the inwardly projecting` teeth ofthe crown Wheel should be' rigidly accurate in the first instance, though the greater the inaccuracies in the teeth of either Wheel the more the grinding reduire-d to bring them both to accuracy.

Having now 'described our invention, what Y we claim as newand rdesire to secure by Letters Patent is:-

1.' A method of finishing gear wheels according to which an internal gear Wheel is disposed completely to encircle an external Agear Wheel, the teethgol' said gear Wheels being equal in number arid complementary in shape, and said gear Wheels by relative axial reciprocating motion `are -then subjected to a series of mutual grinding actions with intermediate circumferential adjustments to engage successively different teeth of'said gear wheels', as set forthl v 2. A lnethodof finishing gear wheels according torwhich ari-internal gear Wheel is disposed completely to encircle an external gear wheel, the teeth ofsaid gear Wheels being equal in number andcomplementaryin shape, torque 1s applied tobrin correspondinfnr tooth faces of said gear W ieels into oprelative axial reciprocating motion are then subjected to a series ofy mutual grinding' actions with intermediate"circumferential ad-` justments to engage successively different teeth of said gear Wheels, as set forth.

In testimony whereof We have signedo.ur l0 names to this specifica-tion.'

CHARLES ALGERNON PARSONS.

STANLEY SMITH COOK.

.TOI-IN FORD. 

